The US has sent Iran a proposal for a nuclear deal between Tehran and Washington, the White House confirmed on Saturday, BBC reported.

Iranian Foreign Minister Abbas Araghchi said he had been presented with "elements of a US deal" by his Omani counterpart Badr Albusaidi during a short visit to the Iranian capital.

It comes after a report by the UN nuclear watchdog said Iran had further stepped up its production of enriched uranium, a key component in the making of nuclear weapons.

White House press secretary Karoline Leavitt said on Saturday it was in Tehran's "best interest to accept" the deal, adding: "President Trump has made it clear that Iran can never obtain a nuclear bomb," according to BBC.